METHOD OF SEALING-UP PIPE LINE Russian patent published in 1998 - IPC

FIELD: repair and restoration jobs on transportation pipe lines. SUBSTANCE: method consists in introducing the sealing polymer into pipe line. Used as polymer material is mixture of copolymer of methyl methacrylate and methacrylic acid at content of acid links ranging from 8.0 to 40.0 mas.% of organic solvents and gel-forming agent. The components are in the following ratio, mas. %: copolymer, 30.3-52.0; solvent, 43.3-54.0; gel-forming agent, 8.0-13.0. EFFECT: enhanced reliability of sealing-up; performance of sealing-up process at ambient temperature with no additional heat; reduced idle time of pipe line. 2 cl